.box{
    background-color: #fff;
}
.add-box{
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    p{
        font-size: 32/7.5vw;
        text-align: center;
        color: #999;
    }
    >a{
        display: block;
        width: 200/7.5vw;
        height: 200/7.5vw;
        padding: 40/7.5vw 0;
        margin: 40/7.5vw auto;
        text-align: center;
        border-radius:50% ;
        background-color: #3cc51f;
        color: #fff;
        font-size: 28/7.5vw;
        box-sizing: border-box;
        >b{
            display: block;
            font-size: 56/7.5vw;
        }
    }
}